Euclid贴近度聚类分析鉴别海面溢油

CLVSTER ANALYSIS OF EUCLID APPROACH FOR IDENTIFICATION OF OIL SPILL AT SEA SURFACE

于1986年对我国常见的14种油品和1984年8月大连湾海面溢油进行气相色谱分析，用模糊数学方法建立ECCIM贴近度聚类分析的海面溢油鉴别模式提出油种鉴别的Euclid贴近度置信水平凡的模糊区概念。油种及其海面溢油的Euclid贴近度聚类分析动态聚类图表明，油种鉴别的置信水平人主要受风化和实验误差的影响，大庆原油、30＃重柴油、20＃重柴油、0＃轻柴油以及任丘原油各自分别同其它13种油可分类的置信水平λ的范围依次为：[0．8726，0．9953），[0．8726，0．9970），［0．8726，0．9857），[0．8807，0．9902）和[0．8726，0．9907）。

Fourteen common oil types of China and spilled oils at sea surface in DalianBay were analysed with gas chromatograms in 1984-1986. The distributions of hy-drocarbons of nine crude oils and five fuel oils mostly ranged from nC8-nC32 andnC10-nC24. The impact of weathering on the oil chromatogram fingerprint is impo-rtant. One month weathering experiment on 3O# heavy diesel oil, O# light diesel oil,and Renqiu crude oil on the seawater, showed the fluctuation of the weathered oilwith carbon less than nC16 was large, than the fluctuation of the weathere oil withcarbon more than nC16, especia1ly Pr and Ph, was less. Pr/nC17, Ph/nC18, Pr/Phand (nC21 - nC22)/(nC19 - nC20)oil type information points for data handling. Amodel is established for fuzzy mathematics clustering analysis of Euclid approachfor identification of sea surface spilled oil. The Euc1id approach between the typesof oil is expressed as:where. xik is the ratio of the hydrocarbon content k in the oil i,xik is the ratio ofthe hydrocarbon content k in the oil j. If the spi1led oil and the suspected sourceoil come from the same source, their Eucllid approach will be equal to or near 1.The concept of fuzzy area of confidence level λ， of Euclid approach for identifingsypes of oil was introduced. The confidence level λ， for the identification of thetea surface spilled oil is found to be greatly influenced not only by the types of theoil, but also by weathering and experimental error. In geneal, the threshold valueof this effects is equal to or more than 0.9857. The results show that the confide-nce levels λ， for differentiating Daqing crude oil, 30# heavy diesel oil, 20 heavy di-esel oil, 0# light diesel oil, and Renqiu crude oil, from other thirteen types of oil,are [0.8726, 0.9953 ), [0.8726, 0.9970), [0.8726, 0.9857), [0.8807, 0.9902 ) and [0.8726,0 .9907), respectively.